Transient power angle stability analysis of emergency wind turbine tripping

With the development of wind power generation, the wind turbine tripping has become an effective emergency control measure. Its mechanism has become a research focus. On basis of the EEAC theory and the influence of wind turbine tripping on system transient stability, this article indicates the mechanism for the rotor-angle stability of synchronous generators. At the time of emergency control, wind turbine tripping leads to change of synchronous generators, such as the mutation of electromagnetic power and the variation of retardation area. As a consequence of these change, the transient power angle stability is suffered. In this context, the analytic expression of electromagnetic power mutation is derived. The factors that influence the rotor acceleration mutation amount are also obtained. The viability of the method is demonstrated through the simulation.